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Unformatted text preview: Respiratory System Moist skin Gills-Aquatic animals-Extensions of the body for circulatory exchange Tracheae-Insects-Branching internal tubes that deliver air-Air enters tracheae through spiracles Lungs-Amphibians, reptiles, mammals, birds-Internal sacs lined with moist epithelium-Capillaries found just below epithelium Human Respiratiory System Conducting Portion Series of passageways that carry air into and out of the gas-exchange portion Brings air to lungs Contains apparatus that makes speaking possible Nasal cavity pharynx Larynx Trachea Bronchi: 2, right and left Bronchioles, smaller tubes Gas Exchange Portion Where gases are exhachaged with he blood in tiny sacs in the lungs Alveoli-300 million-Respiratory surface-Covered by capillaries Across two cell layers Oxygen Transport and Exchange Oxygen transported in blood bound to hemoglobin Exchange in lungs Exchange in body cells Carbon Dioxide Transport and Exchange Transport-Carried by hemoglobin-Carried in plasma as HCO3-Dissolved in plasma Exchange in lungs...
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